CN102701438A - Normal temperature low-ammonia-nitrogen nitrosation starting method - Google Patents
Normal temperature low-ammonia-nitrogen nitrosation starting method Download PDFInfo
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Abstract
A normal temperature low-ammonia-nitrogen nitrosation starting method belongs to the field of urban sewage treatment and reclamation. Researches show that nitrosation starting can be achieved in short time by controlling condition of low dissolved oxygen (DO=0.30mg/L) and inoculating sludge with certain nitrosation effect. If whole course nitration sludge is inoculated, no accumulation of nitrite occurs within 30 days in a water distribution test, no accumulation of nitrite occurs in 30 days in a reactor which utilizes the A/O dephosphorization process processing water as a research object, and the nitrosation starting fails accordingly. Nitrite accumulation can occur by adopting the mode of high-low gradient oxygen limit culture, domesticating the sludge for 10 days under the condition that DO=0.70-0.80mg/L, then controlling condition of low dissolved oxygen (0.30-0.40mg/L) to enable the reactor to discharge water if the whole course nitration sludge is inoculated. Over 90% of nitrosation rate can be achieved within 38 days by continuously domesticating the sludge under the condition of the dissolved oxygen, so that nitrosation can be successfully started.
Description
Technical field
The invention belongs to municipal sewage treatment and resource utilization field.Be specifically related to be exclusively used in the quick start method of the different attribute nitrifying sludge under normal temperature, the low ammonia nitrogen level.
Background technology
At present, the municipal sewage plant adopts traditional technology mostly, like A
2Technology or its improved technology such as/O, oxidation ditch, BAF.Though can obtain good effect aspect the organism removing, for the removal of nutrient nitrogen, phosphorus always poor effect, especially nitrogen remove, be the difficult point in the difficult point always.These technologies all adopt traditional denitrogenation mechanism in denitrogenation; The organonitrogen, the ammonia nitrogen that are about in the water body are oxidized to nitrite nitrogen; Further be oxidized to nitrate nitrogen again; Through the heterotrophic denitrification effect it is reduced into nitrogen again, whole process consumes a large amount of dissolved oxygens, inorganic carbon source (basicity), organic carbon source.The carbon source of sewage is not enough to satisfy the consumption of technology, need add to guarantee treatment effect; Treatment effect receives the restriction of backflow nitrification liquid ratio in addition, is difficult to further lifting.No matter from treatment effect, still on processing cost, traditional denitrogenation has been difficult to satisfy the water quality standard of increasingly stringent.
Since 1976 Anammox (ANAMMOX) by being foretold, the beginning that comes to light in 1994, the mankind have found second denitrogenation approach, i.e. autotrophic denitrification approach.Organonitrogen, ammonia nitrogen in the sewage are changed into nitrite nitrogen by partial oxygen, under the effect of anaerobism autotrophic bacteria, generate nitrogen, realize denitrogenation.In theory, this technology can be practiced thrift a large amount of aerations, whole organic carbon source and 40% inorganic carbon source, is that the ideal of municipal effluent denitrogenation is selected.
At present, adopt the two-stage type reactor drum, i.e. one-level part nitrosification, one-level Anammox about autotrophic denitrification more.The part nitrosification as the preposition unit of Anammox, is born the important task that the proper ratio water inlet is provided for Anammox, is the research focus always.But because the core bacterial classification ammonia oxidation bacteria (AOB) of this technology and NOB (NOB) similar performance, habit is close, is difficult for screening, and research is many through under middle high temperature, the high free ammonia condition, realizes nitrosifying startup and stable.For how realizing quick startup under this normal temperature of sewage, the low ammonia nitrogen condition, study lessly, and comparatively single with the strategy that to adopt simple limit oxygen be the master, suitability is comparatively narrow, for relatively poor this method inefficacy of mud of initial nitrosification effect.Therefore, it is particularly important that exploitation a kind ofly has more extensively, nitrosification mud starts strategy more generally, more efficiently.
Summary of the invention
The object of the present invention is to provide a kind of city domestic sewage that is directed against, promptly under normal temperature, the low ammonia nitrogen condition,, start nitrosifying a whole set of method fast by common nitrifying sludge in conjunction with the proterties of different mud.
The present invention provides a kind of normal temperature to hang down ammonia nitrogen nitrosification startup method, it is characterized in that:
Under DO=0.30 ~ 0.40mg/L hypoxia condition, calculate the nitrosification rate, if the initial nitrosification rate of mud is greater than 30%, lasting acclimation sludge under this hypoxia condition, the nitrosification rate can reach more than 90%, can successfully start nitrosification; If the initial nitrosification rate less than 30% of mud, monitor after 3 days and reached more than 30% as if the nitrosification rate, after more than 10 days, the nitrosification rate can reach more than 90%, starts successfully; The nitrosification rate does not reach 30% after 3 days if monitor; The method of taking height-low gradient limit oxygen is promptly: operation is 10 days under DO=0.70 ~ 0.80mg/L condition; And then reduction dissolved oxygen to 0.30 ~ 0.40mg/L; Lasting acclimation sludge under this hypoxia condition, nitrosification rate can reach more than 90%, can successfully start nitrosification.
The method that nitrosification provided by the present invention starts; Be under normal temperature, low ammonia nitrogen condition; Secondary effluent (phosphorus and organism have obtained removing) with municipal effluent aerobic/anaerobic biological phosphate-eliminating is basic water (COD/N is about 1), in conjunction with the nitrated performance of kind of mud, through different aeration strategies; The control dissolved oxygen is realized the nitrosification of municipal effluent with sequence bioreactor (SBR) mode.Concrete steps are following:
Step 1: reactor drum is built
Reactor drum adopts the sbr reactor device, and reactor drum is equipped with aerating apparatus, can come the dissolved oxygen concentration in the controlling reactor waste water through regulating aeration rate.Reactor drum is provided with simple automatic control device, realizes water inlet, reaction, deposition, drainage flow path automatically.
Step 2: seed sludge
Inoculate common nitrifying sludge, place the sbr reactor device, feed secondary effluent, the beginning aeration, and the control dissolved oxygen is 1mg/L.This step is intended to let seed sludge shake down, and carries out 2 cycles every day, carries out 2 days totally 4 cycles.
Step 3: the confirming of period
The control dissolved oxygen is 0.30 ~ 0.40mg/L, and every separated 30min takes a sample once, and serial sampling is exhausted up to ammonia nitrogen, confirms the sbr reactor time with this.
Step 4: nitrifying sludge performance measurement
The control dissolved oxygen is 0.30 ~ 0.40mg/L strategy, the ammonia nitrogen of monitoring Inlet and outlet water every day, inferior nitrogen, nitre nitrogen, calculating nitrosification rate, i.e. water outlet nitrite nitrogen/(water outlet nitrite nitrogen+water outlet nitrate nitrogen).Carry out 3 days about 6 cycles.If obviously rising appears in the nitrosification rate, reached more than 30%, explain that NOB/AOB is less in kind of the mud, keep this operation strategy to continue acclimation sludge the nitrosification rate can be reached more than 90%, start successfully; The nitrosification rate does not reach 30%, explains that NOB/AOB is bigger in kind of the mud, needs adjustment to start strategy.
Step 5: the aeration strategy of height gradient limit oxygen
When adopting directly limit oxygen can not Rapid Realization nitrosification startup the time; NOB/AOB large percentage in kind of the mud is described; Only be difficult in and realize inferior nitrogen accumulation in a short time, and limit oxygen condition possibly let NOB adapt to low-oxygen environment gradually, and then more be difficult to eliminate through simple limit oxygen.AOB and NOB are aerobic autotrophic bacterias, and self rises in value slower under the normal temperature condition.Can take the height (DO=0.70 ~ 0.80mg/L)-low (method of gradient limit oxygen of DO=0.30 ~ 0.40mg/L).Transform the 1g ammonia nitrogen and can produce the AOB of 0.146g and the NOB of 0.020g, the productive rate of AOB is 7.3 times of NOB productive rate.Under the higher dissolved oxygen of DO=0.70 ~ 0.80mg/L, AOB, NOB can rise in value fast, but the value-added speed of AOB will also can be eliminated out system with the NOB that is adapted to hypoxemia far above NOB.When reducing dissolved oxygen to 0.30 ~ 0.40mg/L, a large amount of AOB that dissolved oxygen had stronger avidity have preferentially obtained dissolved oxygen, and NOB weakens nitrification owing to lack dissolved oxygen, thereby has limited the generation of nitrate salt, the accumulation phenomenon of nitrite occurred.Hyperoxia 10 days (about 20 cycles, the twice of AOB generation cycle), control dissolved oxygen 0.70 ~ 0.80mg/L is not because obvious inferior nitrogen accumulation, can appear in propagation in AOB and NOB; Control dissolved oxygen to 0.30 ~ 0.40mg/L again, begin to occur inferior nitrogen accumulation, indicate as starting successfully with nitrosification rate 90%.
Compare with traditional method, advantage of the present invention is:
The first, under the low ammonia nitrogen condition of normal temperature (15-20 ℃), promptly under the municipal wastewater treatment plant secondary effluent condition of water quality, through the control dissolved oxygen and promptly realize nitrosifying quick startup reaction time, the most only need 12 days, to compare with strategy in the past, speed has obvious lifting;
The second, start the initial nitrosification performance that strategy is considered seed sludge, and, propose different startup strategies, to quicken startup according to performance state;
The 3rd, utilize the specific growth rate of AOB, two kinds of bacteriums of NOB different, the mode through hyperoxia, limit oxygen has realized quick startup nitrosification purpose, and this strategy especially is fit to the simple oxygen of limitting and is difficult for the mud that starts, and the nitrosification that can realize the soonest 15 days starts fast.
Below in conjunction with embodiment the present invention is further described, but protection scope of the present invention is not limited thereto.
Description of drawings
Fig. 1 is 1# reactor drum last effect figure among the present invention, and wherein the △ nitrite nitrogen is an Inlet and outlet water nitrite nitrogen concentration difference; The △ nitrate nitrogen is an Inlet and outlet water nitrate nitrogen concentration difference.
Fig. 2 is 2# reactor drum last effect figure among the present invention, and wherein the △ nitrite nitrogen is an Inlet and outlet water nitrite nitrogen concentration difference; The △ nitrate nitrogen is an Inlet and outlet water nitrate nitrogen concentration difference.
Fig. 3 is 3# reactor drum last effect figure among the present invention, and wherein the △ nitrite nitrogen is an Inlet and outlet water nitrite nitrogen concentration difference; The △ nitrate nitrogen is an Inlet and outlet water nitrate nitrogen concentration difference.
Fig. 4 is 4# reactor drum last effect figure among the present invention, and wherein the △ nitrite nitrogen is an Inlet and outlet water nitrite nitrogen concentration difference; The △ nitrate nitrogen is an Inlet and outlet water nitrate nitrogen concentration difference.
Embodiment
Test is basic water with certain community life sewage through aerobic/anaerobic biological phosphate-eliminating secondary treatment yielding water, and concrete water quality is following: COD=50～80mg/L, BOD
5≤15mg/L, SS≤30mg/L, NH
4 +-N=55～85mg/L, NO
2 --N≤0.25mg/L, NO
3 --N≤1.5mg/L, TP≤1mg/L, pH=7.0～8.5.
The concrete processing as follows:
1# reactor drum seed sludge adopts the artificial distribution from the A of Beijing sewage work nitrifying sludge, and the inoculation back is the operation of limit oxygen directly, and the control dissolved oxygen concentration is 0.30 ~ 0.40mg/L.In the initial nitrosification rate of 1# reactor drum seed sludge is 50%, explains that this seed sludge has certain nitrosification performance.AOB capable of using is different to the avidity of dissolved oxygen with NOB, through the control of limit oxygen, realizes preliminary nitrite nitrogen accumulation.In cycle, mud is in the adaptive phase of hypoxia condition at 1-14, and effect of settling descends, and treatment effect is also unstable.Along with the lasting domestication under the limit oxygen condition, the nitrosification rate raises gradually.After domestication through 7 days (14 cycles), the basic complete oxidation of ammonia nitrogen, simultaneously the nitrosification rate rises to 90% from initial 50%, and ever since stable maintenance more than 90%.The 1# reactor drum is through the artificial distribution, and influent ammonium concentration 85.0 ± 5.0mg/L under the startup strategy of whole process limit oxygen, has realized under the normal temperature condition that nitrosification starts fast in 7 days.
Embodiment 2 is referring to Fig. 2
2# reactor drum seed sludge is from the B of Beijing sewage work nitrifying sludge.In the determination test of the initial proterties of seed sludge, do not find the accumulation of nitrite nitrogen, initial nitrosification rate is almost 0%, is complete nitrification mud.
2# adopts the water distribution scheme identical with 1# and starts strategy, at limit oxygen (DO=0.30 ~ 0.40mg/L) move under the condition.Yet in the cultivation of having passed through 30 days (58 cycles), not seeing has the nitrite nitrogen accumulation in the water outlet.In periodic test, do not see that nitrite occurs as intermediate product yet, ammonia nitrogen is direct oxidation into nitrate salt.It is also lower that ammonia nitrogen transforms load, in 0.028 ~ 0. 069 kgN/kgMLSS/d scope.The 2# reactor drum is through the artificial distribution, and influent ammonium concentration 85.0 ± 5.0mg/L limits in whole process under the startup strategy of oxygen, fails to realize that nitrosification starts in 30 days.
Embodiment 3 is referring to Fig. 3
3# reactor drum seed sludge is from the B of Beijing sewage work nitrifying sludge.In the determination test of the initial proterties of seed sludge, do not find the accumulation of nitrite nitrogen, initial nitrosification rate is almost 0%, is complete nitrification mud.
Adopt district of Beijing septic tank water to start nitrosification through A/O dephosphorization process treat effluent as water inlet, COD is 43.05 ± 12.35mg/L in the water inlet.(DO=0.30 ~ 0.40mg/L) move the accumulation that nitrite nitrogen does not appear in 30 days (32 cycles) back water outlet down, ammonia nitrogen all is oxidized to nitrate nitrogen at the limit oxygen condition.In the periodic test, still do not see the accumulation of nitrite.The 4# reactor drum is through the A/O secondary effluent, and influent ammonium concentration 85.0 ± 5.0mg/L under the startup strategy of whole process limit oxygen, fails to realize that nitrosification starts in 32 cycles.
Embodiment 4 is referring to Fig. 4
4# reactor drum seed sludge is identical with 2#, from the B of Beijing sewage work nitrifying sludge.In the determination test of the initial proterties of seed sludge, do not find the accumulation of nitrite nitrogen, initial nitrosification rate is almost 0%, is complete nitrification mud.But adopt the startup strategy of high-low gradient limit oxygen.In the sludge acclimatization in the early stage, the control dissolved oxygen concentration is 0.70 ~ 0.80mg/L.Yet the accumulation of nitrite nitrogen does not appear in service 10 days (20 cycles) in the water outlet, ammonia nitrogen all is converted into nitrate nitrogen.Reduce dissolved oxygen concentration to 0.30 ~ 0.40mg/L since the 21st cycle, occur a spot of nitrite nitrogen accumulation in the water outlet immediately.In the ensuing cycle, the concentration of nitrite nitrogen is and increases progressively trend in the water outlet, and the concentration of nitrate nitrogen is then more and more littler in the water outlet.Move to the 27th day (the 54th cycle), the nitrosification rate is stabilized in more than 60%, moves to the 38th day (the 77th cycle), and the nitrosification rate reaches more than 90%, indicates the success that nitrosification starts.After this high nitrosification rate more than 90% that maintains that the 3# reactor drum is stable always.The reduction of dissolved oxygen does not make ammonia nitrogen transform load to descend, and the 3# reactor drum transforms at the ammonia nitrogen in service in 110 cycles and loads always stable maintenance about 0.100 kgN/kgMLSS/d.3# reactor drum inoculation complete nitrification mud; Through the artificial distribution, influent ammonium concentration 85.0 ± 5.0mg/L is under the startup strategy of high-low gradient limit oxygen; Occurred initial nitrosification effect at the 10th day, realized after 38 days the operation that nitrosification starts under the normal temperature condition.This test starts the nitrosation reaction device through the startup strategy that adopts height-low gradient limit oxygen at normal temperatures, on control strategy, has saved the energy, has shortened start-up period in time, on effect, has reached the nitrosification rate of stability and high efficiency.
Claims (1)
1. the low ammonia nitrogen nitrosification startup method of normal temperature is characterized in that: under DO=0.30 ~ 0.4mg/L hypoxia condition, calculate the nitrosification rate; If the initial nitrosification rate of mud is greater than 30%; Lasting acclimation sludge under this hypoxia condition, the nitrosification rate reaches more than 90%, successfully starts nitrosification; If the initial nitrosification rate less than 30% of mud, monitor after 3 days and reached more than 30% as if the nitrosification rate, after more than 10 days, the nitrosification rate reaches more than 90%, starts successfully; The nitrosification rate does not reach 30% after 3 days if monitor; The method of taking height-low gradient limit oxygen is promptly: operation is 10 days under DO=0.70 ~ 0.80mg/L condition; And then reduction dissolved oxygen to 0.30 ~ 0.40mg/L; Lasting acclimation sludge under this hypoxia condition, the nitrosification rate reaches more than 90%, promptly successfully starts nitrosification.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058376A (en) * | 2013-01-08 | 2013-04-24 | 北京工业大学 | Method suitable for low-ammonia-nitrogen SBR nitrosation recovery |
| CN103102008A (en) * | 2013-02-25 | 2013-05-15 | 北京工业大学 | SBR nitrosation starting method suitable for municipal household sewage |
| CN103708609A (en) * | 2013-12-15 | 2014-04-09 | 北京工业大学 | Quick culture method of nitrosation granular sludge |
| CN103880170A (en) * | 2014-03-23 | 2014-06-25 | 北京工业大学 | Starting method of nitrosated granule sludge for treating urban sewage |
| CN103896394A (en) * | 2014-03-29 | 2014-07-02 | 北京工业大学 | Starting method of CANON granule sludge of regeneration urban sewage |
| CN107117710A (en) * | 2017-05-22 | 2017-09-01 | 吴迪 | A kind of enhanced biological phosphorus removal method |
| CN107902765A (en) * | 2017-11-28 | 2018-04-13 | 王金龙 | A kind of multistage partial nitrification starts and control method |
| CN112645446A (en) * | 2020-10-20 | 2021-04-13 | 天津城建大学 | Starting method of one-stage SBR-anammox denitrification system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058376B (en) * | 2013-01-08 | 2014-06-11 | 北京工业大学 | Method suitable for low-ammonia-nitrogen SBR nitrosation recovery |
| CN103058376A (en) * | 2013-01-08 | 2013-04-24 | 北京工业大学 | Method suitable for low-ammonia-nitrogen SBR nitrosation recovery |
| CN103102008A (en) * | 2013-02-25 | 2013-05-15 | 北京工业大学 | SBR nitrosation starting method suitable for municipal household sewage |
| CN103708609B (en) * | 2013-12-15 | 2015-05-20 | 北京工业大学 | Quick culture method of nitrosation granular sludge |
| CN103708609A (en) * | 2013-12-15 | 2014-04-09 | 北京工业大学 | Quick culture method of nitrosation granular sludge |
| CN103880170A (en) * | 2014-03-23 | 2014-06-25 | 北京工业大学 | Starting method of nitrosated granule sludge for treating urban sewage |
| CN103880170B (en) * | 2014-03-23 | 2015-06-17 | 北京工业大学 | Starting method of nitrosated granule sludge for treating urban sewage |
| CN103896394A (en) * | 2014-03-29 | 2014-07-02 | 北京工业大学 | Starting method of CANON granule sludge of regeneration urban sewage |
| CN103896394B (en) * | 2014-03-29 | 2015-05-20 | 北京工业大学 | Starting method of CANON granule sludge of regeneration urban sewage |
| CN107117710A (en) * | 2017-05-22 | 2017-09-01 | 吴迪 | A kind of enhanced biological phosphorus removal method |
| CN107117710B (en) * | 2017-05-22 | 2020-04-21 | 青岛锦龙弘业环保有限公司 | Enhanced biological phosphorus removal method |
| CN107902765A (en) * | 2017-11-28 | 2018-04-13 | 王金龙 | A kind of multistage partial nitrification starts and control method |
| CN107902765B (en) * | 2017-11-28 | 2020-05-19 | 苏州诺津环保科技有限公司 | Multistage partial nitrosation starting and controlling method |
| CN112645446A (en) * | 2020-10-20 | 2021-04-13 | 天津城建大学 | Starting method of one-stage SBR-anammox denitrification system |
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Application publication date: 20121003 |